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Kinda weird that any update to the idrive system would then over write the ecu. I cannot recall this occuring at all with any remaps on any vehicle.

Tuning boxes are far more sophisticated than they were and now do monitor sensors to ensure the correct parameters are set, they would definitely not be over written by any update, can be removed at any time and transferred from one vehicle to another. Plus custom maps are also sometimes available.

Having said that they cannot compete with an expert mapper using a dyno to expertly remap a engine. That comes at a price of course.

Like anything there are cowboy companies out there who offer remaps that are just generic ones downloaded from the interweb..
 
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